Magic-Mirror/llvm-capstone
1
0
Fork 0
mirror of https://github.com/capstone-engine/llvm-capstone.git synced 2025-04-04 22:32:18 +00:00
Code Issues Actions2 Packages Projects Releases Wiki Activity

[Local] collectBitParts - for bswap-only matches, limit shift amounts to whole bytes to reduce compile time.

Browse Source
This commit is contained in:
Simon Pilgrim 2021-05-14 11:42:41 +01:00
parent 78c8451cd7
commit 079bbea2b2
1 changed files with 8 additions and 0 deletions

8
llvm/lib/Transforms/Utils/Local.cpp

@ -2940,6 +2940,10 @@ collectBitParts(Value *V, bool MatchBSwaps, bool MatchBitReversals,
if (BitShift.uge(BitWidth))
return Result;
// For bswap-only, limit shift amounts to whole bytes, for an early exit.
if (!MatchBitReversals && (BitShift.getZExtValue() % 8) != 0)
return Result;
const auto &Res =
collectBitParts(X, MatchBSwaps, MatchBitReversals, BPS, Depth + 1);
if (!Res)
@ -3055,6 +3059,10 @@ collectBitParts(Value *V, bool MatchBSwaps, bool MatchBitReversals,
if (cast<IntrinsicInst>(I)->getIntrinsicID() == Intrinsic::fshr)
ModAmt = BitWidth - ModAmt;
// For bswap-only, limit shift amounts to whole bytes, for an early exit.
if (!MatchBitReversals && (ModAmt % 8) != 0)
return Result;
const auto &LHS =
collectBitParts(X, MatchBSwaps, MatchBitReversals, BPS, Depth + 1);
const auto &RHS =